The Mastercool 300 CFM Blower Fan, No. 20300, is a multi-functional product that is used to create a cooler and cleaner air flow in work stations, and it allows equipment to work faster and more efficiently, according to the company. Technicians use these units as a cooling mechanism for shop equipment because of their high volumes of air output. These blowers are also used to dry floors, carpets and paint. The 300 CFM Blower Fan offers a variable speed switch from 950 to 1,650 rpms, has overload protection, 1.0 amps, 11 Amp built-in grounded receptacles and 120V. The 20300 is built from impact-resistant ABS material. The attachment easily converts the 300 CFM blower fan into a heater. This heater fan clips securely onto the front of the blower and plugs into one of the outlets on the side of the blower. The 300 CFM heater attachment has 1320 watts, 120V, 11 amps and 5,000 BTUs.